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[9+(a+2014)\2]x7-15-21=2015

Răspuns :

[9+(a+2014)\2]x7-(15+21)=2015
[9+(a+2014)\2]x7=2015+36=2051
9+(a+2014)\2=2051:7=293
(a+2014)\2=293-9=284
a+2014=284*2=568
a=568-2014
a=-1446

poate este
a-2014=568
a=2014+568
a=2582